The SceneDaily.com Web site reported that both Mayfield and NASCAR filed several documents in U.S. District Court in Charlotte on Thursday ahead of Mayfield's request for a preliminary injunction to prevent the enforcement of his suspension at a hearing next Wednesday.
Mayfield has said a combination of Claritin-D, taken for allergies, and the prescription drug Adderall, taken for attention deficit hyperactivity disorder resulted in a false positive during tests done by Aegis Laboratories, which NASCAR uses for its drug tests.
"I have never taken methamphetamines in my life, and when accused of taking them, I immediately volunteered to give another urine sample," he said in an affidavit that accompanies his brief in support of the injunction request. "The Aegis drug test was erroneous."
He added his race team has lost, and will continue to lose, crucial advertising, sponsorship, and business opportunities.